{"id":"CVE-2026-74877","aliases":["GHSA-hvc7-763r-4f3h","PYSEC-2026-3743"],"url":"https://o3.security/vulnerability/CVE-2026-74877","summary":"openssl_encrypt before 1.4.0 Missing Ownership Verification via revoke_key","details":"### Summary\n\nThe `revoke_key` method in `openssl_encrypt_server/modules/keyserver/service.py` at **lines 195-270** accepts a `client_id` parameter but never verifies that the requesting client is the same as `key.owner_client_id`.\n\n### Impact\n\nAny authenticated client can revoke any other client's key, as long as they provide a valid revocation signature. While the signature requirement mitigates this somewhat (you need the private key to sign), the lack of ownership check is a defense-in-depth gap.\n\n### Recommended Fix\n\n- Add an ownership check: verify `client_id == key.owner_client_id` before allowing revocation\n- Return 403 Forbidden if the requesting client does not own the key\n\n### Fix\n\nFixed in commit `05e45f3` on branch `releases/1.4.x` — added documentation that ML-DSA signature verification IS the cryptographic ownership check; added info-level logging on successful verification.","published":"2026-08-17T11:04:44.926Z","modified":"2026-10-28T02:30:42.863651853Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"openssl-encrypt","fixedVersion":"1.4.0"}],"fix":{"url":"https://github.com/jahlives/openssl_encrypt/commit/05e45f393886b5bf7e924d2dd42099a9dd37f91d","label":"jahlives/openssl_encrypt@05e45f3"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74877.json"},{"type":"ADVISORY","url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-hvc7-763r-4f3h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74877"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-missing-ownership-verification-via-revoke-key"},{"type":"WEB","url":"https://github.com/jahlives/openssl_encrypt/commit/05e45f393886b5bf7e924d2dd42099a9dd37f91d"},{"type":"PACKAGE","url":"https://github.com/jahlives/openssl_encrypt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:42.863651853Z"}}